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Finding the Fourth Proportional to 78,935.50, 109,019.28 and 61,245.10

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Solution

The fourth proportional to 78,935.50, 109,019.28 and 61,245.10 is: 84,586.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,935.50 : 109,019.28 = 61,245.10 : x
  2. Step 2: Convert to fraction form
    78,935.50/109,019.28 = 61,245.10/x
  3. Step 3: Cross multiply
    78,935.50x = 109,019.28 × 61,245.10
  4. Step 4: Simplify right side
    78,935.50x = 6,676,896,705.53
  5. Step 5: Solve for x
    x = 6,676,896,705.53/78,935.50
  6. Step 6: Final answer
    x = 84,586.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.